Turntable Mat question

I use a 10" EP and it beats everything I've tried on my slate- plinth Garrard 401.

some audiophiles will use LP Records as a mat

Seriously? This is nuts.
Ever look at a record? The center is thicker.
Ever look at a platter? The center is recessed.
Now why do you suppose that is?
Do I need to paint you a picture?? https://www.youtube.com/watch?v=zxj3xLDNxo0
So ya stack one record atop another, what do you think is gonna happen? Centers be touching, edge be floating. Wafting up and down. Totally unsupported. All outta kilter.

Nuttiest thing I ever heard of.

Saec SS-300 lightweight allow mat or heavier gunmetal Micro Seiki CU180 - this is everything i need for my DD turntables. 

I use Micro Seiki ST-10 Disc Stabilizer on top or my rare Noritake record weight. 

I've never seen anything better that Micro Seiki and SAEC stuff. 

What kind of turntable do you have?  What kind of platter does it have?  Why do you think you need a different mat?  What are you expecting the new mat to do?

Most of my tables have acrylic platters and I use a clamp or weight and no mat.  I have a couple of DD tables with metal platters and find that the mats that came with them work fine.  I've tried cork and also some deer skin mats.  The cork was good, the deer skin seemed to quiet things down and help with static, but also took some of the life of the music away.  In the end, I'm not using either.

That's why all the questions above.  Maybe you already have things set up well and don't need to change anything.